# Imagick::whiteThresholdImage

(PECL imagick 2, PECL imagick 3)

Imagick::whiteThresholdImage — Force all pixels above the threshold into white

### Beschreibung

public Imagick::whiteThresholdImage(mixed `$threshold`): bool

Is like Imagick::ThresholdImage() but force all pixels above the threshold into white while leaving all pixels below the threshold unchanged.

### Parameter-Liste

`threshold`

### Rückgabewerte

Liefert `true` bei Erfolg.

### Changelog

Version | Beschreibung
--- | ---
PECL imagick 2.1.0 | Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object.

### Beispiele

Beispiel #1 Imagick::whiteThresholdImage()

`<?php
function whiteThresholdImage($imagePath, $color) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->whiteThresholdImage($color);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>`
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